Index: sky/framework/node.dart |
diff --git a/sky/framework/node.dart b/sky/framework/node.dart |
deleted file mode 100644 |
index ec9a1f94fa9f38d0e8297ea64b30018bc3dcc534..0000000000000000000000000000000000000000 |
--- a/sky/framework/node.dart |
+++ /dev/null |
@@ -1,60 +0,0 @@ |
-library node; |
- |
-class Node { |
- |
- // Nodes always have a 'depth' greater than their ancestors'. |
- // There's no guarantee regarding depth between siblings. The depth |
- // of a node is used to ensure that nodes are processed in depth |
- // order. The 'depth' of a child can be more than one greater than |
- // the 'depth' of the parent, because the 'depth' values are never |
- // decreased: all that matters is that it's greater than the parent. |
- // Consider a tree with a root node A, a child B, and a grandchild |
- // C. Initially, A will have 'depth' 0, B 'depth' 1, and C 'depth' |
- // 2. If C is moved to be a child of A, sibling of B, then the |
- // numbers won't change. C's 'depth' will still be 2. |
- |
- int _depth = 0; |
- int get depth => _depth; |
- void redepthChild(Node child) { // internal, do not call |
- assert(child._attached == _attached); |
- if (child._depth <= _depth) { |
- child._depth = _depth + 1; |
- child.redepthChildren(); |
- } |
- } |
- void redepthChildren() { // internal, do not call |
- // override this in subclasses with child nodes |
- // simply call redepthChild(child) for each child |
- } |
- |
- bool _attached = false; |
- bool get attached => _attached; |
- void attach() { |
- // override this in subclasses with child nodes |
- // simply call attach() for each child then call your superclass |
- _attached = true; |
- attachChildren(); |
- } |
- attachChildren() { } // workaround for lack of inter-class mixins in Dart |
- void detach() { |
- // override this in subclasses with child nodes |
- // simply call detach() for each child then call your superclass |
- _attached = false; |
- detachChildren(); |
- } |
- detachChildren() { } // workaround for lack of inter-class mixins in Dart |
- |
- void setAsChild(Node child) { // only for use by subclasses |
- assert(child != null); |
- if (attached) |
- child.attach(); |
- redepthChild(child); |
- } |
- void dropChild(Node child) { // only for use by subclasses |
- assert(child != null); |
- assert(child.attached == attached); |
- if (attached) |
- child.detach(); |
- } |
- |
-} |